The objective of this work was the design, the realization and the characterization of a superconducting coil, capable of generating a peak magnetic field of 100 mT. The measured degradation due to magnetic field and mechanical strain of the electrical properties of Bi-2223/Ag tapes has been taken into account in optimising the design. The resulting configuration consisted in a 10 double-pancakes coil realised with about 300 m of Bi-2223/Ag tape. The real degradation of each double pancake has been investigated by measuring the DC characteristic and the AC losses. The stacking configuration was finally defined by the measured differences among the critical current of each double-pancake. To minimise the effect of the perpendicular magnetic field degradation on the electrical properties of the whole coil, the pancakes with higher I c were mounted at the top and at the bottom. The DC electrical properties as well as the AC losses of the elementary components and of the whole coil have been measured and the results are presented and discussed in this paper.

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Currently the capacity of the circuit is calculated taking into account assumptions that turn out to underutilize the actual capacity of distribution networks with underground cables out, that due to the unavailability of information "on line" of each individual circuit and temperature at the time, length, arrangement in conduits, etc.. The loading of a cable or conductor is commonly called ampacity. Due to economic constraints and limitations because of lack of space, many dealers in the world are striving to increase the carrying capacity of cables in service and the new designed.

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